Remove "font" from initiator type value list

[guohuideng2024]

Bug: w3c/resource-timing#364

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[guohuideng2024]

I am revising/updating the "initiator type" value list.

I think the "font" is a possible request destination, which works with a initiator type of "css". And "font" is not a "initiator type" value.

In fetch standard, "font" is associated with "CSS' @font-face". See the table right below https://fetch.spec.whatwg.org/#request-initiator-type

In the WPT test, it's "css" that's returned for that.

https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/web_tests/external/wpt/resource-timing/initiator-type/style.html;l=42;drc=1d0cf3905ce74eae85ec01cffcb5a438bb042257

There is also a test that shows "font" as a request destination works with a "css" as a initiator type

https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/platform/loader/fetch/resource_fetcher_test.cc;l=1615;drc=e69b5f14cabdba23eb64d347878805c04fb538d6

[domenic]

Can you restore the pull request template?